/*******************************************************************************
 * * Copyright 2012 Impetus Infotech.
 *  *
 *  * Licensed under the Apache License, Version 2.0 (the "License");
 *  * you may not use this file except in compliance with the License.
 *  * You may obtain a copy of the License at
 *  *
 *  *      http://www.apache.org/licenses/LICENSE-2.0
 *  *
 *  * Unless required by applicable law or agreed to in writing, software
 *  * distributed under the License is distributed on an "AS IS" BASIS,
 *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  * See the License for the specific language governing permissions and
 *  * limitations under the License.
 ******************************************************************************/
package com.impetus.kundera.proxy.cglib;

import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import net.sf.cglib.proxy.InvocationHandler;

import com.impetus.kundera.proxy.EnhancedEntity;

/**
 * Implementation of EnhancedEntity using cglib library.
 * 
 * @author animesh.kumar
 */
public class CglibEnhancedEntity implements InvocationHandler, EnhancedEntity
{

    /** The entity. */
    private Object entity;

    /** The id. */
    private String id;

    /** The map. */
    private Map<String, Set<String>> map = new HashMap<String, Set<String>>();

    /**
     * Instantiates a new cglib enhanced entity.
     * 
     * @param entity
     *            the entity
     * @param id
     *            the id
     * @param foreignKeysMap
     *            the foreign keys map
     */
    public CglibEnhancedEntity(final Object entity, final String id, final Map<String, Set<String>> foreignKeysMap)
    {
        this.entity = entity;
        this.id = id;
        this.map = foreignKeysMap;
    }

    /*
     * @see net.sf.cglib.proxy.InvocationHandler#invoke(java.lang.Object,
     * java.lang.reflect.Method, java.lang.Object[])
     */
    /*
     * (non-Javadoc)
     * 
     * @see net.sf.cglib.proxy.InvocationHandler#invoke(java.lang.Object,
     * java.lang.reflect.Method, java.lang.Object[])
     */
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
    {

        String methodName = method.getName();
        int params = args.length;

        if (params == 0 && "getForeignKeysMap".equals(methodName))
        {
            return getForeignKeysMap();
        }
        else if (params == 0 && "toString".equals(methodName))
        {
            return toString();
        }
        else if (params == 0 && "getEntity".equals(methodName))
        {
            return getEntity();
        }
        else if (params == 0 && "getId".equals(methodName))
        {
            return getId();
        }

        return method.invoke(entity, args);
    }

    /* @see com.impetus.kundera.proxy.EnhancedEntity#getForeignKeysMap() */
    /*
     * (non-Javadoc)
     * 
     * @see com.impetus.kundera.proxy.EnhancedEntity#getForeignKeysMap()
     */
    public Map<String, Set<String>> getForeignKeysMap()
    {
        return map;
    }

    /* @see com.impetus.kundera.proxy.EnhancedEntity#getEntity() */
    /*
     * (non-Javadoc)
     * 
     * @see com.impetus.kundera.proxy.EnhancedEntity#getEntity()
     */
    @Override
    public Object getEntity()
    {
        return entity;
    }

    /**
     * Gets the id.
     * 
     * @return the id
     */
    @Override
    public String getId()
    {
        return id;
    }

    /* @see java.lang.Object#toString() */
    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString()
    {
        StringBuilder builder = new StringBuilder();
        builder.append("Proxy [id=");
        builder.append(id);
        builder.append(", entity=");
        builder.append(entity);
        builder.append(", foreignKeys=");
        builder.append(map);
        builder.append("]");
        return builder.toString();
    }

}
